Coal drill



S. MIKULSKI COAL DRILL Nov. 11,1924. 1,515,157

F l y 20. 1920 2 Sheets-Sheet 1 Stanislaw Muzak/5'; 9513' a/H ozMm Nov. 11,1924. 1,515,157

S. MIKULSKI COAL DRILL Filed July 1920 zingers-sheet 2 ZZ v awve ht oz I s'tan is law Mi kulS R1 35 flal'bowwu comparatively narrow iatented Nov. 11, 1924.

STANISLAW' MIKULSKI,

INDIANOLA, PENNSYLVANIA...

COAL DRILL.

Application filed July 20, 1920. Serial 1%. 397,633.

which may be operated with a. miniumuni of exertion and which is of a simple and inexpensive construction.

Another object of the invention is to provide means combined with the drill whereby it may be firmly held within the shafts of a mine and which can be adjusted to fit in restricted spaces whereby, it may be firmly held during its operation.

These and other like objects are attained by the novel construction and combination 'of parts hereinafter described and shown in the accompanying drawings, forming a material part of this application, and in which Figure 1 is a front view of a drill con structed according to the present invention.

Figure 2 is a side view thereof.

Figure 3 is a rear view, and,

Figure 41 is a detail rear view of the adj usting member.

A casing 10 is provided with a. foot 11, and near the lower end of the casing a shaft 12 is journaled in the side walls thereof, to which an operating disc 13 with an operating handle 14: on its rim is secured. At the rear of this disc the shaft 12 carries a sector-toothed wheel 15 in mesh with a gear 16 on a shaft 17 also journaled in the casing above shaft 12. To shaft 17 is also secured a sector-toothed gearing 18 in mesh with a sprocket wheel 19 on a shaft 20 around which the lower end of a chain 21 is guided, the upper end of which is guided over a sprocket wheel 22 on a shaft 23 journaled in the casing near its upper end. I'Vithin the casing this shaft 23 carries a bevel gear 24 in mesh with a similar bevel gear 25 secured within the casing on a shaft 26 extending through the top of the casing. At the upper face of the top plate of the casing this shaft 26 carries a drill 27 secured to the'shaft by means of its socket 28.

A loose sprocket wheel 29 is arranged between the gears 22 and 16 and the sprocket chain 21.

In order to allowan adjustment of the drill between the walls of a mine gang a plate 30 is arranged within the casing'hax ing longitudinal guide grooves 31 in its face with which it is guided along rods 32 provided with stops 33 at the upper ends. The rear face of the plate 30 is provided with a rack part 34- adapted to be engaged by the teeth of a pinion 35 on a shaft 36 secured in a bracket 37 at the rear wall of the casing. The shaft 36 carries a crank handle 38, and a pawl 39 secured to the rear wall of the casing is adapted to engage the teeth of the pinion 35 to hold the plate 30 in its adjusted position.

The operation of the device will be obvious from the foregoing description and the accompanying drawings, and it will be understood, that changes may be made in the construction of minor details and the arrangement of parts without deviating from the spiritand scope of the present invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is In a coal drill of the class described including a casing, the combination of a drill tool with means for manually operating said drill tool, a plate within said casing having longitudinal guide grooves in its faces, rods in said casing" in engagement with said signature.

STANISLAW MIKULSKI.

and a. pawl for normally 

